<mat-sidenav-container>
  <mat-sidenav opened mode="side">
    <mat-toolbar>
      <a mat-icon-button routerLink="..">
        <mat-icon>arrow_back</mat-icon>
      </a>
    </mat-toolbar>
    <mat-nav-list>
      <a mat-list-item routerLink="start">Getting Started</a>
    </mat-nav-list>
  </mat-sidenav>
  <mat-sidenav-content>
    <router-outlet></router-outlet>
  </mat-sidenav-content>
</mat-sidenav-container>